8a0a70bdf75810f1d172da108b3f08920e426426
[platform/upstream/linaro-glibc.git] / sysdeps / generic / w_log10.c
1 /* @(#)w_log10.c 5.1 93/09/24 */
2 /*
3  * ====================================================
4  * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
5  *
6  * Developed at SunPro, a Sun Microsystems, Inc. business.
7  * Permission to use, copy, modify, and distribute this
8  * software is freely granted, provided that this notice
9  * is preserved.
10  * ====================================================
11  */
12
13 #if defined(LIBM_SCCS) && !defined(lint)
14 static char rcsid[] = "$NetBSD: w_log10.c,v 1.6 1995/05/10 20:49:35 jtc Exp $";
15 #endif
16
17 /*
18  * wrapper log10(X)
19  */
20
21 #include "math.h"
22 #include "math_private.h"
23
24
25 #ifdef __STDC__
26         double __log10(double x)                /* wrapper log10 */
27 #else
28         double __log10(x)                       /* wrapper log10 */
29         double x;
30 #endif
31 {
32 #ifdef _IEEE_LIBM
33         return __ieee754_log10(x);
34 #else
35         double z;
36         z = __ieee754_log10(x);
37         if(_LIB_VERSION == _IEEE_ || __isnan(x)) return z;
38         if(x<=0.0) {
39             if(x==0.0)
40                 return __kernel_standard(x,x,18); /* log10(0) */
41             else
42                 return __kernel_standard(x,x,19); /* log10(x<0) */
43         } else
44             return z;
45 #endif
46 }
47 weak_alias (__log10, log10)
48 #ifdef NO_LONG_DOUBLE
49 strong_alias (__log10, __log10l)
50 weak_alias (__log10, log10l)
51 #endif